Processing method of anti-shearing and high temperature-resisting composite water-polyurethane heat-insulation pipe

Abstract

The invention discloses a processing method of an anti-shearing and high temperature-resisting composite water-polyurethane heat-insulation pipe. The processing method is characterized by comprising the following processing steps of: (1) clearing away impurities adhered on the outer wall of a steel pipe; (2) lifting the steel pipe onto a bracket, starting a spray gun to uniformly spray a heat insulation material onto the outer wall of the steel pipe in the form of spray liquid, wherein the spray thickness is 1.5-2.5mm; (3) nesting an external protecting pipe outside the steel pipe through a pipe-penetrating machine within 1-1.5 hours after spraying; and (4) using isocyanate and polyether polyol as spray foaming raw materials, and spraying the raw materials into the external protecting pipe through a foam spraying device so as to form a foam heat-insulation layer. According to the processing method of an anti-shearing and high temperature-resisting composite water-polyurethane heat-insulation pipe, a procedure of spraying the heat insulation material onto the outer surface of the steel pipe is added, so that the coating can play a role of heat insulation and cooling and can improve the product performance; under the use conditions of ultrahigh temperature, the service life of the heat insulation pipe can be prolonged, and the heat insulation pipe can replace a vapor heat-insulation pipe for conveying low-temperature media, so that the input cost is reduced, the purposes of energy saving and consumption reduction are achieved, and the market demand is satisfied.

Description

technical field [0001] The invention belongs to the field of pipe processing, in particular to a processing method for heat insulating pipes. Background technique [0002] In the prior art, my country's hot water insulation pipes mainly adopt the form of polyurethane insulation. In view of the characteristics of insulation materials, the maximum operating temperature has been limited to below 120°C. However, at present, in actual power plants, ultra-high temperature use often occurs, and the temperature is as high as 130-150°C. In this case, it is easy to cause high-temperature carbonization of the polyurethane insulation layer, which affects the insulation effect and service life of the insulation pipe. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a processing method for high-temperature-resistant composite heat-insulating steel pipes. The processing procedure is sim...

AI Technical Summary

Problems solved by technology

However, at present, in actual power plants, ultra-high temperature use often occurs, and the temperature is as high as 130-150°C

In this case, it is easy to cause high-temperature carbonization of the polyurethane insulation layer, which affects the insulation effect and service life of the insulation pipe